A couple of tracks that used to run sprints but don't anymore on a regular basis would be Montpelier and Twin Cities. Not sure if either one of them is interested in pursuing this type of deal but it might be a starting point. Problem there is both run on Saturday night so only one would probably work. Also, Twin Cities I believe currently runs 5 classes and Montpelier 4 so adding another class only makes for a later night. I think that Montpelier also has a curfew so that could play into the equation as well.